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Oil Heat Exam | Oil Burner Operation, Fuel Systems,
Combustion Principles | All Questions and Correct
Answers | Verified Answers | Latest Exam 2025
If a parallel hydronic system is installed it may be necessary to bleed air from each of the parallel circuits ---------CORRECT ANSWER-----------------Yes A zero smoke and low C02 or high 02 reading at the flue pipe and over the fire is an indication? ---------CORRECT ANSWER-----------------Too much air When draft reading cannot be taken over the fire what range is acceptable at the boiler outlet? ---------CORRECT ANSWER------------------. What is a way to test ignition transformer working properly ---------CORRECT ANSWER-----------------Set springs on secondary side of transformer 1/2 apart and check if spark jumps gap when power is supplied to primary side of transformer A fan / limit switch is found on what type of heating system ---------CORRECT ANSWER-----------------Hot air furnace
Oil burners starts but fire does not it maybe because of ---------CORRECT ANSWER- ----------------There is too much combustion air Dust buildup on combustion air can blades would ---------CORRECT ANSWER--------- --------Decrease airflow If an oil burner is not producing visible can it still produce carbon dioxide --------- CORRECT ANSWER-----------------Yes When installing oil fired hot water heater into a chimney with oil fired hot air furnace where should flue for water heater go ---------CORRECT ANSWER------------- ----Above furnace flue pipe Electrical short circuit means ---------CORRECT ANSWER-----------------Occurs whenever power goes directly to nuetral or ground Is it recommended for booster fuel units to be used in combustion with pressure regulating valve as protection when more than one burner is used --------- CORRECT ANSWER-----------------Yes
When must a low water cut off be installed ---------CORRECT ANSWER-----------------
- All boilers 2. Input over 400,000 BTU need second one If the ceiling is over 12 ft in height above burner what must be done in the electrical wiring ---------CORRECT ANSWER-----------------One thermal switch within 6 ft over burner and a second thermal switch in wired in series at height of 10 ft What are three switches in series after the panel and before the appliance --------- CORRECT ANSWER-----------------1. Emergency switch, thermal switch, service switch What is the temperature setting of electrical thermal switch ---------CORRECT ANSWER-----------------165f A person holding an oil burner certificate of compency can perform wiring on what part of the system ---------CORRECT ANSWER-----------------From thermal switch on Where must thermal switch be located ---------CORRECT ANSWER-----------------In the power line with in 6 ft over appliances
Where is the service man switch located ---------CORRECT ANSWER----------------- Where service man can view the fire and maximum of three feet from burner Oil burners must be electrically supplied how ---------CORRECT ANSWER-------------- ---It's own branch circuit from panel What is the pitch of a chimney connector ---------CORRECT ANSWER----------------- 1/4 pitch per foot of length Usual types of frames ---------CORRECT ANSWER-----------------M or N flange mounting frame How must a chimney connector be fasted together ---------CORRECT ANSWER------- ----------At least 3 screws 1/2 or more from section join Where must a power vent system terminate ---------CORRECT ANSWER--------------- --At least four feet below or horizontal from a window, one foot above the door, window or air inlet and at least 12" above grade Chimney connector for natural draft can be up tp how long ---------CORRECT ANSWER-----------------Shall not exceed 10 ft
Minimum size copper tubbing that can be used for oil supply and return line ------- --CORRECT ANSWER-----------------3/8" nominal Oil tanks from 660 to 1320 gallons must meet what standards ---------CORRECT ANSWER-----------------UL Oil tanks from 10 to 660 gallons must meet what standards ---------CORRECT ANSWER-----------------UL What must be done with fill and vent piping if oil tanks is removed --------- CORRECT ANSWER-----------------Remove all piping How must the crimped end of a single wall flue connector pipe be installed --------- CORRECT ANSWER-----------------Toward the chimney How is a power vent sized ---------CORRECT ANSWER-----------------Maximum input of appliances
What must be done to oil supply line that comes in contact with concrete on earth ---------CORRECT ANSWER-----------------Continuous non metallic. Sleeve that extends 4" past contacted material Readily accessible hand operated fusible spring loaded valve installed where on oil line ---------CORRECT ANSWER-----------------One near burner one near tank The timing of lock out of primary control for burner with three to twenty gallon per hour would be ---------CORRECT ANSWER-----------------15 seconds The timing of primary control for burner with three gallon or less per hour would be ---------CORRECT ANSWER-----------------15 seconds Two oil tanks with a common fill and vent must ---------CORRECT ANSWER----------- ------1. Oil supply lines connecting two both tanks must be 1/2" o.d. Or 1/2" iron pipe
- Level with eachother
- Fills and vent to different tanks
- 2" vent pipe minimum What would cause higher vacuum than calculated ---------CORRECT ANSWER-------- ---------Restricted oil flow in the line
Exposed tanks(more than one) in a building cannot be more than how many gallons? ---------CORRECT ANSWER-----------------1320 gallons All oil tanks over how many gallons must have an open air pipe? ---------CORRECT ANSWER-----------------10 gallons All oil tanks over 10 gallons must have an open air pipe, minimum pipe size of 1 and 1/4, The fill pipe cannot exceed the size of vent pipe both must terminate? --- ------CORRECT ANSWER-----------------outside building What is the maximum total capacity of all the tanks located above the lowest level of a building cannot exceed how many gallons? ---------CORRECT ANSWER---- -------------60 gallons The maximum total capacity of all the tanks located above the lowest level of a building has an exception what is it? ---------CORRECT ANSWER-----------------A tank on slab adjacent to the first floor what cant be used for fill or vent piping? ---------CORRECT ANSWER----------------- plastic pipe, solder copper tubing and fittings
What must be done with any unused openings of an oil tank? ---------CORRECT ANSWER-----------------made vapor tight All oil tanks over 10 gallons must have an open air vent pipe and a minimum pipe size of? ---------CORRECT ANSWER-----------------1 1/ All oil tanks with fill and vent pipes must have what type of gauging? --------- CORRECT ANSWER-----------------Visual and Audible Vent pipe must terminate at least how many feet above grade? ---------CORRECT ANSWER-----------------3 ft or above the highest snow level Massachusetts flash point is ---------CORRECT ANSWER-----------------115 F Massachusetts flame point is ---------CORRECT ANSWER-----------------635F Your vent pipe must terminate _______ feet vertically and ____ feet horizontally from any building opening ---------CORRECT ANSWER-----------------2ft, 2ft
What is the exception to not using compression fittings on oil supply lines? --------- CORRECT ANSWER-----------------Gauge able 2 ferrule swage type fittings Before an oil tank is removed, is a permit need to be obtained? ---------CORRECT ANSWER-----------------Yes Can Teflon tape be used on an oil supply lines ---------CORRECT ANSWER-------------- ---No Are compression fittings acceptable on oil supply lines ---------CORRECT ANSWER-- ---------------No Is a draft control damper required ---------CORRECT ANSWER-----------------Yes Does oil tank under 10 gallons used with an oil burner need an oil permit? --------- CORRECT ANSWER-----------------No Outside oil tanks must be mounted on what? ---------CORRECT ANSWER-------------- ---A slab 4 inch thick and extends 8 inch all around tank with one pour
What is Ohm's Law? ---------CORRECT ANSWER-----------------Ohms= volts/current According to Ma code what is one gallon #2 fuel oil ---------CORRECT ANSWER------ -----------138,690 btus #2 oil home heating fuel is ---------CORRECT ANSWER-----------------85% carbon 15% hydrogen What is the voltage on primary and secondary side of burner transformer --------- CORRECT ANSWER-----------------120 v primary 10,000 v for secondary What is a Hartford loop needed for ---------CORRECT ANSWER-----------------Prevent water from siphoning from boiler What two readings are needed to find out efficiency ---------CORRECT ANSWER----- ------------Stack temperature and 02 or C02 readings black wire in a typical electrical circuit is called the ---------CORRECT ANSWER------- ----------hot wire
alternating current in the US operates at how many cycles per second --------- CORRECT ANSWER----------------- 60 electrical wire is rated for ---------CORRECT ANSWER-----------------ampacity 12 gauge wire would typically be good for up to how many amp circuit breaker ---- -----CORRECT ANSWER-----------------20 amp 10 gauge wire would typically be good for up to how many amp circuit breaker ---- -----CORRECT ANSWER-----------------30 amp 14 gauge wire would typically be good for up to how many amp circuit breaker ---- -----CORRECT ANSWER-----------------15 amp all electrical wire connections should be made where ---------CORRECT ANSWER---- -------------junction box where are the hot wires connected on single pole switch ---------CORRECT ANSWER-----------------gold terminals
how are the neutral wires connected when wiring a single pole switch --------- CORRECT ANSWER-----------------together what type of circuit has one path to complete circuit ---------CORRECT ANSWER----- ------------series the code for electrical work done in Massachusetts is ---------CORRECT ANSWER---- -------------National Electrical Code a device that responds to change in air temperature opening or closing a switch is called ---------CORRECT ANSWER-----------------thermostat what is the safety that opens if temperature goes above preset point --------- CORRECT ANSWER-----------------limit control the spill switch is usually installed where ---------CORRECT ANSWER----------------- next to draft diverter
G ---------CORRECT ANSWER-----------------fan R ---------CORRECT ANSWER-----------------low voltage power w ---------CORRECT ANSWER-----------------heating c ---------CORRECT ANSWER-----------------common RH ---------CORRECT ANSWER-----------------low voltage power heat only RC ---------CORRECT ANSWER-----------------low voltage power cooling only W2= ---------CORRECT ANSWER-----------------heat second stage Y2 ---------CORRECT ANSWER-----------------cooling second stage
what is the minimum gauge wire that can supply thermostat ---------CORRECT ANSWER----------------- 18 voltage of typical heating system from panel is ---------CORRECT ANSWER------------ -----120 volts what letters are on low volatage side of a 24v transformer ---------CORRECT ANSWER-----------------R and C what would happen if the wire off R terminal made contact with a wire coming off C terminal without first going through a load device ---------CORRECT ANSWER------ -----------would blow low voltage fuse or if there's not a fuse in that line the transformer would become defective and need replacement. How is the primary control wired ---------CORRECT ANSWER-----------------In a series with the burner What is the maximum amount of gallons of oil storage allowed in a building without a special license ---------CORRECT ANSWER-----------------10,000 gallons
